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Thread: Curved box tops with concave/convex router jig

  1. #1

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    starkw1's Tools

    Curved box tops with concave/convex router jig

    I have admired the curved top box made by Clark Kellog (Work — Clark Kellogg and wanted to make something similar

    I've made a few curved top boxes with a jig (my Gen 1) that had a fixed radius. It works OK, but if you need to change the radius, you need to make new curved rails.

    Curved box tops with concave/convex router jig-pic1.jpg


    I wanted a fixture where I could adjust the radius of curvature and more easily adjust the height of my router.

    I envisioned the scheme shown below

    Curved box tops with concave/convex router jig-pic2.jpg
    Curved box tops with concave/convex router jig-pic3.jpg


    The inspiration for this came postings I've seen form lutheriers for making guitar of other stringed instruments. The jig has a router carriage that allows the router to move back and forth (or left and right). The workpiece is screwed or clamped to a pivoting support that can swing about +30 with the router carriage in place. The same fixture is used for both concave and convex surfaces; the workpiece is mounted on the “top” of the pivoting support for convex surfaces, and on the bottom for concave surfaces. Similarly, the router carriage rails need to be moved from the “high” position for milling convex surfaces to the “low” position for milling concave surfaces. A ¼-20" micro adjuster on each end of the pivoting support allows for small increments to be milled on each pass.
    Curved box tops with concave/convex router jig-pic4.jpg

    I am still learning to use this jig, but it seems to work well for the pine, Douglas Fir, and red oak that I have milled so far.

    Curved box tops with concave/convex router jig-pic5.jpg
    Curved box tops with concave/convex router jig-pic6.jpg

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  2. The Following 14 Users Say Thank You to starkw1 For This Useful Post:

    high-side (Jun 12, 2020), Jon (Apr 8, 2018), Kevic (Apr 9, 2018), mwmkravchenko (Jun 12, 2020), odd one (May 6, 2022), Paul Jones (Apr 8, 2018), PJs (Apr 10, 2018), ranald (Apr 21, 2018), rlm98253 (Apr 9, 2018), Seedtick (Apr 9, 2018), steamingbill (Apr 9, 2018), toma (Apr 10, 2018), Toolmaker51 (Jun 12, 2020), wb8nbs (Apr 9, 2018)

  3. #2
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    Thanks starkw1! We've added your Curved Routing Jig to our Routing category,
    as well as to your builder page: starkw1's Homemade Tools. Your receipt:




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  4. #3
    Supporting Member toma's Avatar
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    toma's Tools
    Very good job,thank you

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    Supporting Member mwmkravchenko's Avatar
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    Nice way to make a radiused top. Hope you get a lot of use out of it. Looks like you spent some time making up the jig!

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    Supporting Member Toolmaker51's Avatar
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    Toolmaker51's Tools
    starkw1,
    Never seen anything like it; that it was inspired by others does not lessen your effort, a successful one at that!
    I have seen fixtures supporting a router to flat plane or rabbet large pieces. Yours is a branch of that, but far more engineering before hand, and better execution.
    I wonder about warping. Do the segments join alternate ends [or opposite faces] to counteract it?



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    Toolmaker51
    ...we'll learn more by wandering than searching...

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